So after a late night and lots of maths I've got the current calculated weight of Wolf-E.

The weight is looking to be about 8.8kg leaving 4.8kg to play with. Currently its size will be 25.5cm x 38cm x 10cm.

The previous weight and size was 9.8kg with 3.8kg spare. The size was 29.5cm x 38cm x 10cm.